It depends. Do you need extra reinforcement at the seams? If yes, then use tape. If not, you can wrap the cloth over the edge, rounding the edge makes it easier. Leave an inch or so overlap. If you are using epoxy you can trim the cloth when it starts to set up.

Depending on what strength you wish yes and no.Most boatbuilding plans call for taped seams this adds extra rigidity and strength, pretty important when you are trying to keep out the h20.I have rebuilt quite a few truck cabs and most manufacturers don't tape the seams allowing a very little amount of flex and expansion of the wood components.You should not need to tape the seams as you will have about 5m of edge per side between your walls and front/roof/back on a standard 8 ft x4ft build also you will get lots of strength from the cross bracing (mostly the galley).In my own honest opinion I would only tape if I was intending on fitting a roof rack or intended to hang an awning. whatever you decide, its right at the time.

On my epoxy/FG over foamie hybrid build I stagger overlapped 2 plies of 6oz up on top of the roof with no additional tape at the profile corner. I did somewhat of a Steve Fredrick's method with the roof sitting on top of the walls, and added a 3/4 inch round over to the profile (easy to do in 1-1/2 thk foam).

Mine was literally stitched together with copper wires. Filleted and glass taped on the inside. Then wires were clipped and the outside glassed. The floor was held in place with screws. After the floor was secured with fillets and glass tape, the screws were removed.